[llvm-bugs] [Bug 44184] New: ICE in ActOnCapScopeReturnStmt when default argument contains statement-expression

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Nov 29 11:19:41 PST 2019 

https://bugs.llvm.org/show_bug.cgi?id=44184

            Bug ID: 44184
           Summary: ICE in ActOnCapScopeReturnStmt when default argument
                    contains statement-expression
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: arthur.j.odwyer at gmail.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

// https://godbolt.org/z/VE-Zk4
int test1() {
    [](int = ({return 42; 0;}) ) {};
    return 17;
}
int test2() {
    [](decltype( ({return 42; 0;})  )) {}(0);
    return 17;
}

GCC compiles these function into the equivalent of "return 42" and "return 17"
respectively.
Intel ICC rejects the first function with "error: a statement expression is not
allowed inside of a default argument", and ICEs with "bad pointer" on the
second function.

Clang ICEs on both functions. I think it would be reasonable for Clang to
follow Intel ICC and give a hard error on any attempt to abuse
statement-expressions like this; but Clang still shouldn't ICE.


Stack dump:
0.      Program arguments:
/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10 -cc1 -triple
x86_64-unknown-linux-gnu -S -disable-free -disable-llvm-verifier
-discard-value-names -main-file-name example.cpp -mrelocation-model static
-mthread-model posix -mframe-pointer=all -fmath-errno -masm-verbose
-mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64
-dwarf-column-info -debug-info-kind=limited -dwarf-version=4
-debugger-tuning=gdb -resource-dir
/opt/compiler-explorer/clang-trunk-20191129/lib/clang/10.0.0 -internal-isystem
/opt/compiler-explorer/gcc-9.2.0/lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0
-internal-isystem
/opt/compiler-explorer/gcc-9.2.0/lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0/x86_64-linux-gnu
-internal-isystem
/opt/compiler-explorer/gcc-9.2.0/lib/gcc/x86_64-linux-gnu/9.2.0/../../../../include/c++/9.2.0/backward
-internal-isystem /usr/local/include -internal-isystem
/opt/compiler-explorer/clang-trunk-20191129/lib/clang/10.0.0/include
-internal-externc-isystem /usr/include/x86_64-linux-gnu
-internal-externc-isystem /include -internal-externc-isystem /usr/include
-std=c++2a -fdeprecated-macro -fdebug-compilation-dir /home/ubuntu
-ferror-limit 19 -fmessage-length 0 -fgnuc-version=4.2.1 -fno-implicit-modules
-fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option
-fcolor-diagnostics -faddrsig -o ./output.s -x c++ <source> 
1.      <source>:3:22: current parser token ';'
2.      <source>:2:13: parsing function body 'test'
3.      <source>:2:13: in compound statement ('{}')
4.      <source>:3:5: lambda expression parsing
5.      <source>:3:15: in compound statement ('{}')
 #0 0x0000555af942f0fa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x29580fa)
 #1 0x0000555af942ce14 llvm::sys::RunSignalHandlers()
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x2955e14)
 #2 0x0000555af942cf52 SignalHandler(int)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x2955f52)
 #3 0x00007faa0cd95890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x0000555afafd400f
clang::Sema::ActOnCapScopeReturnStmt(clang::SourceLocation, clang::Expr*)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x44fd00f)
 #5 0x0000555afafd49b7 clang::Sema::BuildReturnStmt(clang::SourceLocation,
clang::Expr*)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x44fd9b7)
 #6 0x0000555afafd535a clang::Sema::ActOnReturnStmt(clang::SourceLocation,
clang::Expr*, clang::Scope*)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x44fe35a)
 #7 0x0000555afaae6c45 clang::Parser::ParseReturnStatement()
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x400fc45)
 #8 0x0000555afaaebbef
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*,
clang::Parser::ParsedAttributesWithRange&)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x4014bef)
 #9 0x0000555afaaed6e9
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x40166e9)
#10 0x0000555afaae86d1 clang::Parser::ParseCompoundStatementBody(bool)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x40116d1)
#11 0x0000555afaae8f4e clang::Parser::ParseCompoundStatement(bool, unsigned
int) (/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x4011f4e)
#12 0x0000555afaaa4a3a
clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&, bool,
bool, clang::OpaquePtr<clang::QualType>&, clang::SourceLocation&)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3fcda3a)
#13 0x0000555afaa9d457 clang::Parser::ParseCastExpression(bool, bool, bool&,
clang::Parser::TypeCastState, bool)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3fc6457)
#14 0x0000555afaa9f7e4 clang::Parser::ParseCastExpression(bool, bool,
clang::Parser::TypeCastState, bool)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3fc87e4)
#15 0x0000555afaaa0991
clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3fc9991)
#16 0x0000555afaa82740
clang::Parser::ParseParameterDeclarationClause(clang::Declarator&,
clang::ParsedAttributes&,
llvm::SmallVectorImpl<clang::DeclaratorChunk::ParamInfo>&,
clang::SourceLocation&)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3fab740)
#17 0x0000555afaaaf3f2
clang::Parser::ParseLambdaExpressionAfterIntroducer(clang::LambdaIntroducer&)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3fd83f2)
#18 0x0000555afaab0193 clang::Parser::ParseLambdaExpression()
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3fd9193)
#19 0x0000555afaa9e3b0 clang::Parser::ParseCastExpression(bool, bool, bool&,
clang::Parser::TypeCastState, bool)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3fc73b0)
#20 0x0000555afaa9f7e4 clang::Parser::ParseCastExpression(bool, bool,
clang::Parser::TypeCastState, bool)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3fc87e4)
#21 0x0000555afaaa0991
clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3fc9991)
#22 0x0000555afaaa1639
clang::Parser::ParseExpression(clang::Parser::TypeCastState)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3fca639)
#23 0x0000555afaaee50d
clang::Parser::ParseExprStatement(clang::Parser::ParsedStmtContext)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x401750d)
#24 0x0000555afaaebeab
clang::Parser::ParseStatementOrDeclarationAfterAttributes(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*,
clang::Parser::ParsedAttributesWithRange&)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x4014eab)
#25 0x0000555afaaed6e9
clang::Parser::ParseStatementOrDeclaration(llvm::SmallVector<clang::Stmt*,
32u>&, clang::Parser::ParsedStmtContext, clang::SourceLocation*)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x40166e9)
#26 0x0000555afaae86d1 clang::Parser::ParseCompoundStatementBody(bool)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x40116d1)
#27 0x0000555afaaf36e3 clang::Parser::ParseFunctionStatementBody(clang::Decl*,
clang::Parser::ParseScope&)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x401c6e3)
#28 0x0000555afaa5c938
clang::Parser::ParseFunctionDefinition(clang::ParsingDeclarator&,
clang::Parser::ParsedTemplateInfo const&, clang::Parser::LateParsedAttrList*)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3f85938)
#29 0x0000555afaa7f110 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&,
clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3fa8110)
#30 0x0000555afaa58311
clang::Parser::ParseDeclOrFunctionDefInternal(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec&, clang::AccessSpecifier)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3f81311)
#31 0x0000555afaa58a61
clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*, clang::AccessSpecifier) (.part.209)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3f81a61)
#32 0x0000555afaa5ea56
clang::Parser::ParseExternalDeclaration(clang::Parser::ParsedAttributesWithRange&,
clang::ParsingDeclSpec*)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3f87a56)
#33 0x0000555afaa60099
clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3f89099)
#34 0x0000555afaa605c5
clang::Parser::ParseFirstTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3f895c5)
#35 0x0000555afaa53e86 clang::ParseAST(clang::Sema&, bool, bool)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x3f7ce86)
#36 0x0000555afa225312 clang::CodeGenAction::ExecuteAction()
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x374e312)
#37 0x0000555af9b667a9 clang::FrontendAction::Execute()
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x308f7a9)
#38 0x0000555af9b2684a
clang::CompilerInstance::ExecuteAction(clang::FrontendAction&)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x304f84a)
#39 0x0000555af9c2e01b
clang::ExecuteCompilerInvocation(clang::CompilerInstance*)
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0x315701b)
#40 0x0000555af78600f5 cc1_main(llvm::ArrayRef<char const*>, char const*,
void*) (/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0xd890f5)
#41 0x0000555af77c9caa main
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0xcf2caa)
#42 0x00007faa0bc53b97 __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21b97)
#43 0x0000555af785d77a _start
(/opt/compiler-explorer/clang-trunk-20191129/bin/clang-10+0xd8677a)
clang-10: error: unable to execute command: Segmentation fault (core dumped)
clang-10: error: clang frontend command failed due to signal (use -v to see
invocation)
Compiler returned: 254

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